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REGN7999

Phase 2

Non-Transfusion Dependent Beta-Thalassemia (NTDT) | Small molecule | Hematology |Regeneron Pharmaceuticals, Inc.|Last Updated: Mar 18, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment95
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06421636A Study to Test the Safety, Tolerability, and Efficacy of an Antibody, REGN7999, Injected Under the Skin for the Treatment of Iron Overload in Adult Participants With Non-Transfusion Dependent β-thalassemia, Using MRI Scans to Measure Iron Levels in the BodyPHASE2 RECRUITING 95Sep 30, 2024Jan 24, 2028Mar 18, 202626 United States, Georgia +7
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Study Endpoints
Primary Endpoints
Change from baseline in Liver Iron Concentration (LIC) by R2* Magnetic Resonance Imaging (MRI)
At week 24
Incidence of Treatment-Emergent Adverse Events (TEAEs)
Up to week 72
Severity of TEAEs
Up to week 72
Secondary Endpoints
Achievement of ≥20% reduction from baseline in LIC by R2* MRI
Through week 52
Change from baseline in hemoglobin
To week 24
Change from baseline in LIC by R2* MRI
At week 52
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part A High DoseEXPERIMENTALRandomized 2:2:1
Part A Low DoseEXPERIMENTALRandomized 2:2:1
Part A PlaceboPLACEBO_COMPARATORRandomized 2:2:1
Part B High DoseEXPERIMENTALRandomized 2:2:1
Part B Low DoseEXPERIMENTALRandomized 2:2:1
Part B PlaceboPLACEBO_COMPARATORRandomized 2:2:1
Interventions
NameTypeDescription
REGN7999DRUGAdministered subcutaneous (SC)
PlaceboDRUGAdministered SC
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Eligibility Criteria
Age Range18 Years — 65 Years
SexALL
Healthy VolunteersNo
Study Sites26

Key Inclusion Criteria: 1. Clinical diagnosis of NTDT as described in the protocol 2. IOL, defined as LIC ≥ 5 mg Fe/g DW as measured by R2\* MRI at screening 3. Serum ferritin ≥ 300 ng/mL as described in the protocol Key Exclusion Criteria: 1. Hemoglobin ≤ 8 g/dL at screening 2. Any RBC transfusi...

Countries:United StatesGeorgiaGreeceIndiaItalyMalaysiaThailandTurkey (Türkiye)United Kingdom
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT06421636primaryCompletionDate: changed
LOWMay 24, 2026NCT06421636studyFirstPostDate: changed